public class SimpleMetadataStore extends java.lang.Object implements ConcurrentMetadataStore
MetadataStore
that uses an in-memory map only.
The metadata will not be persisted across application restarts.Constructor and Description |
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SimpleMetadataStore() |
Modifier and Type | Method and Description |
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java.lang.String |
get(java.lang.String key)
Reads a value for the given key from this MetadataStore.
|
void |
put(java.lang.String key,
java.lang.String value)
Writes a key value pair to this MetadataStore.
|
java.lang.String |
putIfAbsent(java.lang.String key,
java.lang.String value)
Atomically insert the key into the store.
|
java.lang.String |
remove(java.lang.String key)
Remove a value for the given key from this MetadataStore.
|
boolean |
replace(java.lang.String key,
java.lang.String oldValue,
java.lang.String newValue)
Atomically replace the value for the key in the store if the old
value matches the oldValue argument.
|
public void put(java.lang.String key, java.lang.String value)
MetadataStore
put
in interface MetadataStore
key
- The key.value
- The value.public java.lang.String get(java.lang.String key)
MetadataStore
get
in interface MetadataStore
key
- The key.public java.lang.String remove(java.lang.String key)
MetadataStore
remove
in interface MetadataStore
key
- The key.public java.lang.String putIfAbsent(java.lang.String key, java.lang.String value)
ConcurrentMetadataStore
putIfAbsent
in interface ConcurrentMetadataStore
key
- The key.value
- The value.public boolean replace(java.lang.String key, java.lang.String oldValue, java.lang.String newValue)
ConcurrentMetadataStore
replace
in interface ConcurrentMetadataStore
key
- The key.oldValue
- The old value.newValue
- The new value.